package com.example.coolweather;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import com.example.coolweather.db.CoolWeatherDB;
import com.example.coolweather.model.City;
import com.example.coolweather.model.County;
import com.example.coolweather.model.Province;
import com.example.coolweather.util.HttpUtil;
import com.example.coolweather.util.Utility;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class ChooseAreaFragment extends Fragment {
    public static final int LEVEL_PROVINCE=0;
    public static final int LEVEL_CITY=1;
    public static final int LEVEL_COUNTY=2;
    private ProgressDialog progressDialog;
    private TextView titleText;
    private Button backButton;
    private ListView listView;
    private ArrayAdapter<String> adapter;
    private List<String> dataList =new ArrayList<>();

    private List<Province> provinceList;
    private List<City> cityList;
    private List<County> countyList;

    private Province selectedProvince;
    private City selectedCity;

    private int currentLevel;

    private CoolWeatherDB db;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view =inflater.inflate(R.layout.choose_area,container,false);
        db=CoolWeatherDB.getInstance(getContext());
        titleText=(TextView) view.findViewById(R.id.title_text);
        backButton=(Button) view.findViewById(R.id.back_button);
        listView=(ListView) view.findViewById(R.id.list_view);
        adapter=new ArrayAdapter<>(getContext(),android.R.layout.simple_list_item_1,dataList);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                if(currentLevel==LEVEL_PROVINCE){
                    selectedProvince=provinceList.get(i);
                    queryCities();
                }else if(currentLevel==LEVEL_CITY){
                    selectedCity=cityList.get(i);
                    queryCounties();
                }
            }
        });
        backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (currentLevel==LEVEL_COUNTY){
                    queryCities();
                }else if(currentLevel==LEVEL_CITY){
                    queryProvinces();
                }
            }
        });
        queryProvinces();
        return view;
    }


    private void queryProvinces(){
        titleText.setText("中国");
        backButton.setVisibility(View.GONE);
        provinceList=db.loadProvince();
        if(provinceList.size()>0){
            dataList.clear();
            for (Province province: provinceList){
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_PROVINCE;

        }else {
            String address="http://guolin.tech/api/china";
            queryFromServer(address,"province");
        }
    }


    private void queryCities(){
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        cityList=db.loadCity(selectedProvince.getId());
        if (cityList.size()>0){
            dataList.clear();
            for (City city:cityList){
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_CITY;
        } else {
            String provinceCode=selectedProvince.getProvinceCode();
            String address="http://guolin.tech/api/china/"+provinceCode;
            queryFromServer(address,"city");
        }
    }


    private void queryCounties(){
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        countyList=db.loadCounty(selectedCity.getId());
        if(countyList.size()>0){
            dataList.clear();
            for (County county:countyList){
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel=LEVEL_COUNTY;
        }else {
            String provinceCode=selectedProvince.getProvinceCode();
            String cityCode=selectedCity.getCityCode();
            String address="http://guolin.tech/api/china/"+provinceCode+"/"+cityCode;
            queryFromServer(address,"county");
        }
    }


    private void queryFromServer(String address,final String type){
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onFailure(@NonNull Call call, @NonNull IOException e) {
                 getActivity().runOnUiThread(new Runnable() {
                     @Override
                     public void run() {
                         closeProgressDialog();
                         Toast.makeText(getContext(),"加载失败",Toast.LENGTH_SHORT).show();
                     }
                 });
            }

            @Override
            public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
                  String responseText=response.body().string();
                  boolean result=false;
                  if ("province".equals(type)){
                      result= Utility.handleProvinceResponse(responseText,getContext());
                  } else if("city".equals(type)){
                      result=Utility.handleCityResponse(responseText,selectedProvince.getId(),getContext());
                  }else if ("county".equals(type)){
                      result=Utility.handleCountyResponse(responseText,selectedCity.getId(),getContext());
                  }

                  if(result){
                      getActivity().runOnUiThread(new Runnable() {
                          @Override
                          public void run() {
                              closeProgressDialog();
                              if ("province".equals(type)){
                                  queryProvinces();
                              }else if ("city".equals(type)){
                                  queryCities();
                              }else if("county".equals(type)){
                                  queryCounties();
                              }
                          }
                      });
                  }
            }

        });
    }


    private  void showProgressDialog(){
        if (progressDialog==null){
            progressDialog=new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载......");
            progressDialog.setCanceledOnTouchOutside(false);
        }
        progressDialog.show();
    }

    private void closeProgressDialog(){
        if(progressDialog!=null){
            progressDialog.dismiss();
        }
    }


}
